... existing cassette and FM transmitter solutions. Directly control from car stereo panel,user only need a SD card or USD disk ... FM transmitter solutions.Control Digital Music changer from your car redio buttons.Works also with steering wheel controlsSupport USB ... , Volkswagen,Mazda,Hyundai,Audi ,SkodaCompatible with aftermarket Radio: Panasonic, Sony, Alpine,M-bus, Clarion,Ce-net, Pioneer, and Sanyo.